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STK401-140 数据表(PDF) 7 Page - Sanyo Semicon Device

部件名 STK401-140
功能描述  AF Power Amplifier (Split Power Supply) (50 W 50 W 50W min, THD = 0.08%)
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制造商  SANYO [Sanyo Semicon Device]
网页  https://www.sanyo-av.com/us/
标志 SANYO - Sanyo Semicon Device

STK401-140 数据表(HTML) 7 Page - Sanyo Semicon Device

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External Circuit Diagram
Heat Radiation Design Considerations
The radiator thermal resistance
θc-a required for total substrate power dissipation Pd in the STK400-290 is determined as:
Condition 1: IC substrate temperature Tc not to exceed 125°C.
Pd
× θc-a + Ta < 125°C ···························· (1)
where Ta is the assured ambient temperature.
Condition 2: Power transistor junction temperature Tj not to exceed 150°C.
Pd
× θc-a + Pd/N × θj-c + Ta < 150°C ······(2)
where N is the number of power transistors and
θj-c the thermal resistance per power transistor chip.
However, power transistor power consumption is Pd equally divided by N units.
Expressions (1) and (2) can be rewritten based on
θc-a to yield:
θc-a < (125–Ta)/Pd ····································(1)'
θc-a < (150–Ta)/Pd–θj-c/N························(2)'
The required radiator thermal resistance will satisfy both of these expressions.
From expressions (1)' and (2)', the required radiator thermal resistance can be determined once the following
specifications are known:
Supply voltage
VCC
Load resistance
RL
Assured ambient temperature
Ta
The total substrate power consumption when STK400-290 VCC is ±32 V and RL is 6 Ω, for a continuous sine wave
signal, is a maximum of 105 W (Figure. 1). In general, when this sort of continuous signal is used for estimation of
power consumption, the Pd used is 1/10th of PO max (slight variation depending on safety standard).
Pd = 66.5 W (1/10 PO max=during 5 W)
No. 4822-7/10
STK400-290


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